Limestone-based wet flue gas desulfurization process
US5630991A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1994 |
| Grant date | May 20, 1997 |
| Priority date | — |
| Expiry date | Aug 16, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/502
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The limestone dissolution rate for limestone-containing slurries used in wet flue gas desulfurization (WFGD) systems is enhanced by the addition of ammonium ions. The ammonium ions may be obtained by incorporating into the limestone-containing slurry gaseous or aqueous ammonia and/or a water-soluble ammonium salt, such as ammonium sulfate, ammonium chloride, or ammonium carbonate. Increasing the limestone dissolution rate for limestone-containing slurries used in WFGD systems allows courser limestone particles, lower limestone stoichiometry and lower slurry recycle rates to be employed, thereby saving capital and operating costs. The ammonium ions may be recovered and reused in the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.